动物的基因变异性与适应策略。
Genic variability and strategies of adaptation in animals.
作者信息
Selander R K, Kaufman D W
出版信息
Proc Natl Acad Sci U S A. 1973 Jun;70(6):1875-7. doi: 10.1073/pnas.70.6.1875.
Abstract
Levels of genic heterozygosity, as measured by surveys of allozymic variation, are much lower in populations of large, mobile animals (most vertebrates) than in those of small, relatively immobile animals (most invertebrates). This difference is not consistent with theories relating variability to population size (species number) or dispersal ability (gene flow), but it is predicted by Levins' theory of adaptive strategies in relation to environmental uncertainty ("grain"). Mobility and degree of homeostatic control apparently are important factors influencing levels of genic heterozygosity in natural populations. The results argue indirectly that at least a major proportion of allozymic variation is maintained by natural selection.
摘要
通过对等位酶变异的调查来衡量，大型、可移动动物（大多数脊椎动物）种群中的基因杂合度水平远低于小型、相对不移动动物（大多数无脊椎动物）种群中的基因杂合度水平。这种差异与将变异性与种群大小（物种数量）或扩散能力（基因流动）相关联的理论不一致，但它是由莱文斯关于与环境不确定性（“粒度”）相关的适应性策略理论所预测的。移动性和稳态控制程度显然是影响自然种群中基因杂合度水平的重要因素。这些结果间接表明，至少大部分等位酶变异是由自然选择维持的。
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